verifiedCite
While every effort has been made to follow citation style rules, there may be some discrepancies. Please refer to the appropriate style manual or other sources if you have any questions.
Select Citation Style

What theories explain the Iron Pillar of Delhi’s rust resistance?

Theories on the Iron Pillar’s rust resistance include a a chemical explanation involving the formation of a crystalline iron hydrogen phosphate hydrate layer that makes the pillar corrosion resistant and a climatic explanation that posits that Delhi’s atmosphere aids the formation of the crystalline iron hydrogen phosphate hydrate layer that makes the pillar corrosion resistant.